About Hers to Claim by Patricia A. Knight
Scornfully rejected by her desert lover and uncertain of her place in the world, Adonia travels an arduous road fraught with peril to the fabled mountain-city of Nyth Uchel. She wishes to heal their sick and dying, but in the arms of Hel—their highborn prince—Adonia finds where she wants to belong.
Noble born, a descendant of the greatest kings their planet has known, Hel willingly bears the burden of his dying city and its people on his massive shoulders—alone. But forced to watch helplessly as a dark evil attacks the very soil under his feet, he crushes his pride to summon help. He is staggered to discover the answer to saving his city and perhaps all Verdantia might lie behind a heavy fall of chocolate hair and shy brown eyes.
As their entire planet faces encroaching black death, Hel and Adonia, two seemingly disparate individuals, forge a partnership of love and sacrifice that alters their future forever.